Pliable tungsten weight adhesive putty.
These tins contain 30g of mouldable putty ideal for adding balance weight to your slot cars.
It is so easy to just measure off the few grams of weight you require.
Just kneed the putty in your fingers for a short while to soften it, and then press into the area you want to weigh down to form the exact shape you require.
It's the perfect replacement for the lead weights of old.